In order to secure a computer and its resources, we must take into consideration what rights users will have.  We can secure a computer or multiple computers by granting users or groups specific user rights.  We can secure an object, such as a file or folder, through assigning permissions to allow users or groups to perform specific actions on that object.  We often need to set ACLs on files or even folders.  In our real life when we deploy any application we may need to set proper permission in respect of a file or folder.  It is true that admin can set any type of permission in respect of a file or folder in an application.  But in the deployment server we may not have the permission to set ACLs manually.  In that scenario we can set required permission in respect of a file or folder in application using new features of ACLs in .NET Framework 2.0.